Early autumn · Weather & things to do
Charleston in September
Charleston cools off: highs slip to 84°F (29°C), from 89°F in August, with lows of 69°F (21°C) and about 4.7 in (119 mm) of rain.
Our comfort score puts it mid-table at 66/100, 9th of 12.
- Avg high
- 84°F (29°C)
- Avg low
- 69°F (21°C)
- Rain
- 4.7 in (119 mm)
- Humidity
- 80%
- Cloud cover
- 58%
- Daylight
- ~12 h 11 min
- Comfort score
- 66/100 · Good
What September feels like
Days are warm, averaging 84°F (29°C).
Nights cool to an average low of 69°F (21°C).
Humidity averages 80%, so the air feels sticky and the heat feels stronger than the thermometer says.
Showers are part of the month, adding up to about 4.7 in (119 mm).
Plan around September
September sits mid-table; the best months are March & April and November.
- Comfort improves from 50/100 in August to 66/100.
- Our Charleston & Savannah route recommends Mar – May, so September falls outside its suggested window.
What to pack for September
- Light, breathable clothes84°F afternoons
- Quick-dry fabrics80% average humidity
- Packable rain jacket or umbrellaabout 4.7 in of rain
- Comfortable walking shoesmost places below are best reached on foot or with short walks
What to do in Charleston in September
September is good outdoor weather here, so these picks lean toward the open air.
The Rooftop at The Vendue
Rooftop bar over the waterfront with views of the harbor and steeples.
Why now September scores 66/100 for comfort, good conditions for being outside.
Rainbow Row
Thirteen pastel Georgian houses on East Bay Street, the city's classic photo.
Why now Highs near 84°F and 4.7 in of monthly rain make this an easy outdoor pick.
White Point Garden
Oak-shaded park at the Battery with harbor views and antebellum mansions behind.
Why now One to do outside while the weather is on your side.
Magnolia Plantation and Gardens
Sprawling romantic-style gardens on the Ashley River, with history tours.
Fort Sumter National Monument
Ferry to the island fort where the Civil War's first shots were fired.
Nearby in September
- Beaufort in September~49 mi · highs 84°F, 3.9 in rain · similar daytime temperatures, drier
- Savannah in September~83 mi · highs 85°F, 4.1 in rain · similar daytime temperatures, drier
- Amelia Island in September~171 mi · highs 82°F, 5.4 in rain · 1°C (2°F) cooler by day, wetter
- Uptown Charlotte in September~177 mi · highs 84°F, 3.9 in rain · similar daytime temperatures, drier
NASA POWER 2001–2025 monthly averages on a ~50 km grid. Comfort scores weigh temperature, rain, humidity and cloud: see how we score each month. Check a forecast before you go.
Charleston in September: quick answers
Is September a good time to visit Charleston?
It's middling, scoring 66/100. The best months are March & April and November, at up to 88. Expect highs of 84°F (29°C) and 4.7 in (119 mm) of rain. Our Charleston & Savannah route recommends Mar – May, so September is outside its suggested window.
How hot is Charleston in September?
Average highs are 84°F (29°C) and average lows 69°F (21°C), making it the 4th-warmest month by daytime highs.
Does it rain a lot in Charleston in September?
Some: about 4.7 in (119 mm) of rain falls across September on average, the 4th-wettest month of the year. The annual total is about 49.0 in (1245 mm).
What should I pack for Charleston in September?
Bring light, breathable clothes (84°F afternoons), quick-dry fabrics (80% average humidity), packable rain jacket or umbrella (about 4.7 in of rain) and comfortable walking shoes (most places below are best reached on foot or with short walks).
Planning Charleston in September?
Plan it together in TripsCircle: one itinerary, one shared packing list and costs split as you go.